Cardiac Markers Updated Apr 17, 2026

Lipoprotein-Associated Phospholipase A2 (Lp-PLA2)

Lipoprotein-Associated Phospholipase A2 (Lp-PLA2) is a lab value that reflects the amount or activity of an enzyme carried with lipoproteins in blood. On a blood test, Lp-PLA2 is used as a marker in some cardiac panels, where the Lipoprotein-Associated Phospholipase A2 test result helps describe lipid-related blood chemistry.

What Is Lipoprotein-Associated Phospholipase A2 (Lp-PLA2)?

Lipoprotein-Associated Phospholipase A2 (Lp-PLA2) is an enzyme associated with lipoproteins in the bloodstream. On a lab report, Lp-PLA2 may appear as a value that reflects how much of this enzyme is present or how active it is, depending on the assay. The Lipoprotein-Associated Phospholipase A2 on a blood test is usually reported as part of a cardiac-focused panel rather than a general chemistry panel. It helps describe the interaction between circulating lipids and a measured enzyme signal.

Why Is Lipoprotein-Associated Phospholipase A2 (Lp-PLA2) Tested?

Lp-PLA2 is tested in some cardiac panels to add context about lipid-related blood chemistry. The Lp-PLA2 test is not part of a standard CBC or CMP, but it may appear with other heart-focused markers in specialized ordering panels. A Lipoprotein-Associated Phospholipase A2 test result can be reviewed alongside cholesterol-related values to give a broader picture of lipoprotein biology. In a Lipoprotein-Associated Phospholipase A2 on a lab report, the full name and abbreviation may both be listed.

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Lipoprotein-Associated Phospholipase A2 (Lp-PLA2) Normal Range

Group Range Unit
Adult Male 0–200 ng/mL
Adult Female 0–200 ng/mL

Reference ranges may vary by laboratory and individual factors.

What Does High Lp-PLA2 Mean?

A high Lp-PLA2 result generally means more of the enzyme signal is being measured in the sample. In many labs, a Lipoprotein-Associated Phospholipase A2 normal range is interpreted using the assay-specific cut point, and values above that range are considered high Lp-PLA2. Depending on the method, a high Lp-PLA2 test result may reflect greater enzyme activity linked with circulating lipoproteins. Some reports flag values above the lab’s stated threshold, so the exact cutoff matters more than a single universal number.

Associated factors

Higher lipoprotein load — more circulating lipoproteins can increase the measured Lp-PLA2 signal.
Recent smoking exposure — tobacco exposure is associated with higher Lp-PLA2 in some people.
Higher saturated-fat intake — diet patterns that raise lipid transport particles may be linked with high Lp-PLA2.
Lower physical activity — less activity can be associated with a less favorable lipoprotein profile and high Lp-PLA2.
Older age — Lp-PLA2 tends to vary with age, and some older adults show higher values.
Male sex — reference distributions for Lp-PLA2 can differ between men and women.
Certain lipid-lowering medicines — some medications can change the measured Lp-PLA2 level or activity.
Inflammatory state — broad shifts in circulating proteins can influence a high Lp-PLA2 test result.
Recent meal pattern — in some assays, recent dietary intake can slightly change lipoprotein-associated measurements.

What Does Low Lp-PLA2 Mean?

A low Lp-PLA2 result means the measured enzyme signal is below the lab’s reference interval. In a Lipoprotein-Associated Phospholipase A2 normal range, values below the lower bound are considered low Lp-PLA2. This may reflect less enzyme activity, lower lipoprotein-associated signal, or assay-specific variation. A low Lp-PLA2 test result is often interpreted with the rest of the cardiac panel rather than by itself.

Associated factors

Low circulating lipoproteins — fewer lipoprotein particles can reduce the measured Lp-PLA2 signal.
Recent body composition changes — rapid changes in lipid transport can be linked with low Lp-PLA2.
High physical activity — regular exercise may lower the measured enzyme level in some people.
Lower dietary fat intake — reduced fat intake can be associated with low Lp-PLA2.
Certain lipid-lowering medicines — some therapies can reduce Lp-PLA2 activity or concentration.
Female sex — some reference intervals for Lp-PLA2 are slightly lower in women.
Younger age — younger adults may show lower Lp-PLA2 values than older adults.
Sample handling variation — delayed processing can sometimes shift a low Lp-PLA2 test result.
Hydration status — shifts in plasma volume can slightly change measured concentration.

How Lipoprotein-Associated Phospholipase A2 (Lp-PLA2) Relates to Other Values

Because Lp-PLA2 is reviewed on a cardiac panel, it is often read with total cholesterol, HDL cholesterol, LDL cholesterol, and triglycerides. Those values describe how much fat-related material is carried in blood, while Lp-PLA2 adds an enzyme-based measure tied to lipoprotein biology. When Lp-PLA2 appears with apolipoprotein B (ApoB), the combination can help show whether the lipoprotein particle burden is high or low. On a Lipoprotein-Associated Phospholipase A2 on a lab report, the result is usually interpreted with the panel pattern instead of as a stand-alone number.

What Factors Affect Lipoprotein-Associated Phospholipase A2 (Lp-PLA2) Levels?

Lp-PLA2 can vary by age, sex, and overall lipoprotein pattern. Time of day, recent eating, and hydration can slightly shift a Lipoprotein-Associated Phospholipase A2 test result, especially when the assay measures concentration. Altitude, smoking, and exercise can also influence high Lp-PLA2 or low Lp-PLA2 patterns through effects on circulating lipoproteins. Different laboratory methods may report different units or cut points, so the Lipoprotein-Associated Phospholipase A2 reference range is assay-specific. Pregnancy and major weight change can also alter the measured pattern in a cardiac panel.

How It Is Tested

The Lp-PLA2 test is done on a blood sample drawn from a vein. The lab measures either enzyme activity or enzyme concentration, depending on the method used, and reports the result as a numeric value. Common units include nmol/min/mL for activity assays or ng/mL for mass assays.

How to Prepare

No fasting is usually required for an Lp-PLA2 test, though some cardiac panels include other markers that may have specific preparation rules. The laboratory’s instructions control the final test setup.

Frequently Asked Questions

What is the normal range for Lipoprotein-Associated Phospholipase A2?
The Lipoprotein-Associated Phospholipase A2 normal range is assay-specific, but many labs use a reference interval around 0 to 200 ng/mL for mass-based testing. Some reports use activity units instead, so the exact Lipoprotein-Associated Phospholipase A2 reference range must match the method on the lab report. The Lp-PLA2 result should always be read with the unit and the lab’s stated cut points.
What does Lp-PLA2 stand for?
Lp-PLA2 stands for lipoprotein-associated phospholipase A2. On a blood test, Lp-PLA2 is a marker tied to lipoproteins and enzyme activity or concentration, depending on the assay. The full name may appear on a Lipoprotein-Associated Phospholipase A2 on a lab report with the abbreviation in parentheses.
What does a high Lipoprotein-Associated Phospholipase A2 mean on a lab report?
A high Lp-PLA2 result means the measured value is above the lab’s Lipoprotein-Associated Phospholipase A2 normal range. Depending on the test method, this can reflect more enzyme activity or more enzyme mass linked to circulating lipoproteins. A high Lp-PLA2 test result is often interpreted together with cholesterol markers and the rest of the cardiac panel.
What does a low Lipoprotein-Associated Phospholipase A2 mean on a lab report?
A low Lp-PLA2 result means the measured value falls below the lab’s reference interval. This can reflect lower enzyme activity, fewer lipoprotein particles carrying the enzyme, or method-related variation. A low Lp-PLA2 test result is usually reviewed in the context of the full Lipoprotein-Associated Phospholipase A2 on a lab report.
Can hydration affect Lipoprotein-Associated Phospholipase A2?
Hydration can slightly affect Lp-PLA2 because changes in plasma volume can alter how concentrated a blood marker appears. The effect is usually small, but it may matter near the high or low cutoff. This is one reason the Lipoprotein-Associated Phospholipase A2 test result is best compared with the same lab method over time.
What is the difference between Lipoprotein-Associated Phospholipase A2 and LDL cholesterol?
Lp-PLA2 measures an enzyme signal linked to lipoproteins, while LDL cholesterol measures the cholesterol carried in low-density lipoproteins. LDL cholesterol is reported in mg/dL, and Lp-PLA2 may be reported in ng/mL or activity units depending on the assay. On a cardiac panel, the two values give different types of information about blood composition.
What unit is Lipoprotein-Associated Phospholipase A2 measured in?
Lp-PLA2 may be measured in ng/mL for mass-based assays or nmol/min/mL for activity-based assays. The unit on the Lipoprotein-Associated Phospholipase A2 test result depends on the specific laboratory method. The unit is important because the Lipoprotein-Associated Phospholipase A2 normal range changes with the assay.
How much can Lipoprotein-Associated Phospholipase A2 change between tests?
Lp-PLA2 can change modestly between tests because of normal biologic variation, hydration, recent diet, and differences in lab method. Small shifts near the cutoff are common, while large changes are less typical without a major change in lipoprotein pattern. Comparing results from the same type of Lp-PLA2 test helps with trend reading.
Is Lipoprotein-Associated Phospholipase A2 different for men and women?
Some labs use the same Lp-PLA2 reference range for men and women, while others note small sex-related differences in the distribution. The difference is usually modest and depends on the assay and the population used to set the range. On a Lipoprotein-Associated Phospholipase A2 on a blood test, the lab’s own reference interval is the key number.
Why is Lipoprotein-Associated Phospholipase A2 tested in a cardiac panel?
Lp-PLA2 is included in some cardiac panels because it adds information about lipoprotein-linked enzyme activity beyond standard cholesterol measures. The Lp-PLA2 test can help round out the pattern seen with LDL cholesterol, HDL cholesterol, triglycerides, and ApoB. In that setting, the Lipoprotein-Associated Phospholipase A2 test result is read as part of a broader blood composition profile.

Disclaimer

This content is for informational and educational purposes only. It is not intended as medical advice, diagnosis, or treatment recommendation. Reference ranges may vary by laboratory. Always discuss your results with a qualified healthcare professional.

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